Correct and rational cabling improves network communication speed and reliability

A network is a connection system that connects independent devices and enables them to share information and resources. Correct design and implementation of a network system can improve the speed and reliability of communication, so that a system can work more efficiently. Network Construction should meet the requirements of published national and international standards, and should be able to continuously evolve and upgrade according to changes in business requirements.
With the extensive use of computers, people are paying more and more attention to the topics of network and wiring. In the past, IT managers concerned about communication systems only by phone. On the other hand, they have to face more complex and rapidly changing computing and information systems. In the past, desktop computers used to work independently ,. Now this situation has changed. At present, more than 50% of commercial computers are connected to Lan, which can greatly improve work efficiency. A lan can connect computers with servers and peripherals, or provide signal channels for sensors, cameras, monitors, and other electronic devices. If these links are on a temporary basis, the work zone will soon be filled with various unidentifiable cables, making troubleshooting and maintenance impossible.
Integrating electronic devices for computing, building security, and environmental control tasks into an integrated system will produce greater benefits. When the number of independent devices increases, the benefits of working with these devices become more apparent. Of course, the demand for Device Links will also increase accordingly. The same is true for companies that already have complex computer systems. The transformation from traditional host and microcomputer to Client/Server systems means that private networks will surely be replaced by open systems.
The use of networks is also being expanded to new fields. For the first time, many managers will face how to develop cabling policies for network security systems, video conferencing systems, and multimedia information systems. As the network is constantly expanding in this way, all management personnel need to understand the network knowledge.
Network Construction Strategies
The selection of network and cable types is mainly determined by the type of the devices to be connected, their locations, and their usage. Before planning, it is necessary to give a description of the potential network load. When a network serves multiple systems, the peak traffic of their hybrid data should be carefully considered.
For a complete new system, the main task of load evaluation is to calculate the number of network nodes and ask each department about the usage requirements in "worst case. When an existing system is replaced, the system usage should be monitored for one week or longer before planned replacement. When software upgrade is also part of the system upgrade, such as upgrading a computer from a DOS environment to a Windows environment, it is very difficult to evaluate the network complexity. However, software vendors may give an assessment of network communication traffic. In the planning phase, planning for future needs and planning for current needs should be equally important.
The average target life cycle of the cabling system is 15 years, which is consistent with the renovation cycle of the main building. During this period, the computer hardware, software, and usage of the system will change significantly. The throughput, reliability, and security requirements of the network must be increased.
In the early stages of network construction, as an important part of the work, professionals should also formulate detailed technical indicators for the network. IT administrators often make mistakes to develop rough technical indicators for networks and wiring. Immature networks may cause system crashes at a very high cost. Therefore, it is unwise to save too much money during the network installation phase.
The following key factors should be taken into account when formulating detailed network technical indicators:
Usage, including the mixed data stream traffic size and peak load duration of all applications
Number of users and possible growth rate
Users' location and distance between them
Possible probability of user location change
Connection with current and future computers and software
Available space for cable cabling
Total investment of the network owner
Regulations and security requirements
Importance of preventing service loss and Data leaks purpose of network configuration Selection
Currently, three types of data network topologies are commonly used. They are a ring network, a total line network, and a star network. As described in the name, a continuous ring is used to connect each device. It ensures that signals sent from one device can be seen by all other devices on the ring. In a simple ring network, damage to any part of the Network will lead to system faults, which will hinder the normal operation of the entire system. The ring-shaped network with an advanced structure has greatly improved this defect.
Card Ring
An example of a ring network is a licensing ring LAN with a transmission rate of 4 Mbit/s and 16 Mbit/s. This network structure was first launched by IBM, but is now used by other manufacturers. In the Token Ring Network, devices with a "token" can transmit data over the network. This ensures that only one device in the network can transmit information at a certain time.
Bus Network
A bus network uses a certain length of cable, that is, a necessary high-speed communication link to connect devices together. The device can be removed from the bus without affecting the operation of other devices in the system. Ethernet is the most important implementation in a bus network. It has become the standard for LAN. The device connected to the bus checks the data sent to itself by monitoring the information transmitted on the bus. When two devices want to send data within the same time, the Ethernet will crash, but the CSMA/CD is monitored using a carrier to listen for multiple accesses/collisions) the protocol can minimize the negative impact of the collision.
Star Network
The composition of the star network connects many point-to-point connections through the central device. In the telephone network, the center structure is PABX. In a data network, this type of device is a host or hub. In a star network, you can easily increase or decrease devices without affecting the operation of other devices in the system. To be continued)
Wiring term
100Base-T4 uses a 4-wire 100 Mbit/s fast Ethernet Over 3 type cables.
100Base-TX uses 2-wire 100 Mbit/s fast Ethernet for Category 5 cables.
100VG-AnyLAN was first developed by Hewlett-Packard and AT&T to use the 100 Mbit/s local network using the requirement priority protocol.
10 Base-T uses unshielded twisted pair UTP) cables, meeting the IEEE Standard of the association of electronic and electrical engineers and Ethernet.
The temporary cabling system uses different types of cabling components produced by multiple manufacturers to implement the cabling system scheme of the cabling system.
Analog transmission uses continuous variables and direct physical measurements, such as voltage, to represent the signal transmission mode.
A system is used, and the associated transmission modes are supported by the telecom cabling system.
The Application Layer Open System Interconnection Model OSI) is the highest layer ). This layer is mainly used to support communications between user applications and management applications, such as email applications and file transfer applications.
Asynchronous two or more signal sources use independent clock signals, so they have different frequencies and phases.
Asynchronous data transmission is a data transmission method. The numbers or letters to be transmitted are displayed in a 7-to 8-bit binary number table, in this way, a 7/8-bit data transmission method is formed to implement data transmission on digital transmission media.
Asynchronous transfer mode (ATM) is a high-speed, cell-based exchange technology. It uses multiple technologies to place speech, Data, video, and other signals in fixed-length data packet units). These units are transmitted along the exchange path, and they do not arrive at the receiver in a fixed order, so the asynchronous term is used ).
Attenuation reduces the signal as the length of the transmission line or the distance between radio waves increases.
An integral part of the trunk Integrated Wiring System, including a main cable used to support connection from the equipment room to the upstairs, or from the wiring room on the same floor, and corresponding facilities.
A balanced circuit is used to generate the same and opposite signals. It sends these signals to two wires. The better the equilibrium characteristic of the circuit, the smaller the signal scattering, and the better the noise suppression characteristic. Therefore, the better its EMC performance ).
Balanced twisted pair cables include one or more pairs of metal symmetric unit twisted pair wires or twisted pair wires.
An unbalanced transformer is used to achieve impedance matching between a balanced and non-balanced line. It is usually used between a twisted pair and a coaxial cable.
The available frequency range for transmitting information over one channel. It indicates the channel transmission capability. Therefore, the wider the bandwidth, the more information the circuit can transmit. The bandwidth is measured in Hz, bit/s, or MHz. km is used for optical fiber ).